[gunmaker]

Don't want to say that you might not have a problem, or concern. Looking at the metal in the photos, they remind me of the chips I get while turning something on the lathe. They don't appear to me to be the kind of debris I would expect from damaged gears, bearings or internals. Myself, I'd be inclined to throughly clean out the whole axle assembly, expect it carefully, and if no suspicous damage, wear, play exists, then re-assemble it with new seals and fluid. I would then service the axle again in another 10-20 hours, if no other symptoms appear, and judge then.
Saying that, and considering that she has only 50 hours on her, I think I'd be as inclined to show, but not give, the shavings to the dealer, and let them pull the axle apart for an inspection under warranty.
Either way, good luck...I'd love to hear how you make out, the 3320 is something of interest in my future. Craig